3" diameter 4130 steel tubes with 7075 aluminum end bells. Includes housing ends. For street use. Installation - Service instructions can be found on Service Bulletin #0054. Due to the variety of options available, please collect your dimensions, know your suspension and how it will be mounted (4-link, leaf spring, ladder bar, etc.), then call 1-866-508-6394 or contact us to place your order.  Installation - Service instructions can be found on Service Bulletin #0054.